Research on Shear Bearing Performance of Vertical Grouting Joints of Steel-Concrete Tower Barrel

Owing to its high stiffness, good stability, relatively fast construction and low maintenance cost, steel-concrete composite structure is often used in the tower support structure of wind turbines. Steel-concrete tower barrel is usually produced and transported in vertical segments. During construction, the vertical grouting joint is formed by secondary pouring of high-strength grouting material. The shear performance of the joint directly affects the overall performance of the tower barrel. Through the static test of four vertical grouting joint specimens of concrete tower barrel under direct shear load, the failure mode and load-slip curve were analyzed, and ABAQUS was used to establish the refined finite element model of vertical grouting joint under pure shear load. The accuracy and applicability of the model were verified by comparing with the test results, which not only verified the influence of ratio of U-shaped shear bars and longitudinal reinforcement on bearing capacity but also laid a foundation for parameter analysis and calculation formula of bearing capacity.